Pressure measuring cap

Abstract

A valve stem system includes a valve stem that is fluidly coupled to a tire thereby facilitating the valve stem to selectively inflate and deflate the tire. A sensing unit is coupled to the valve stem and the sensing unit is visible on the valve stem. The sensing unit is in fluid communication with the valve stem to sense air pressure within the tire thereby facilitating the sensing unit to display the air pressure within the tire. A valve stem assembly includes a pressure sensing body and a valve core configured to threadedly engage the tire stem and regulate air flow from a tire. The pressure sensing body includes plunger that responds to pressure fluctuations in the tire and provides a continuous measurement of air pressure.

What is claimed is: 
     
       1. A valve stem assembly, comprising:
 a pressure sensing body configured to measure and indicate an air pressure, the pressure sensing body having:
 a cylindrical shape with a central internal hollowed section; 
 an inner cylinder having a first plunger, the inner cylinder configured to surround a portion of the hollowed section, the inner cylinder including a port to permit fluid communication between the hollowed section and a portion of the inner cylinder; and 
 an outer cylinder having a second plunger, the outer cylinder radially coupled to an outer portion of the inner cylinder, the outer cylinder in fluid communication with the inner cylinder; 
 
 a fluid located between the first plunger and the second plunger, the fluid passing between both the inner cylinder and the outer cylinder as pressure changes within the hollowed section; and 
 a valve core coupled to the pressure sensing body and covering the internal hollowed section, the valve core configured to regulate pressure inside the internal hollowed section uniformly through the inner and outer cylinders. 
 
     
     
       2. The assembly of  claim 1 , wherein the valve core includes a valve body, a cap stem core, and a stem tip, the cap stem core located beneath the valve body and the stem tip located above the valve body. 
     
     
       3. The assembly of  claim 2 , wherein the stem tip is configured to regulate airflow through the valve body and into the internal hollowed section of the pressure sensing body. 
     
     
       4. The assembly of  claim 2 , wherein depression of the stem tip into the valve body opens fluid communication through the valve body. 
     
     
       5. The assembly of  claim 1 , further comprising:
 a viewing pane in communication with an outer wall of the outer cylinder, the viewing pane is at least partially transparent so as to permit observation of the pressure level in the internal hollowed section. 
 
     
     
       6. The assembly of  claim 5 , wherein the viewing pane is configured to provide markings to indicate the air pressure within the internal hollowed section. 
     
     
       7. The assembly of  claim 1 , wherein the volume of the inner cylinder is different from the volume of the outer cylinder. 
     
     
       8. The assembly of  claim 1 , further comprising:
 a spring within the outer cylinder to press against the second plunger, the spring and the air pressure in the hollowed section act upon the first and second plunger. 
 
     
     
       9. The assembly of  claim 8 , wherein pressure changes in the hollowed section cause the first plunger and the second plunger to translate within the respective cylinder. 
     
     
       10. A valve stem assembly, comprising:
 a tire valve stem having a stem cap configured to regulate the transfer of air through the tire valve stem; 
 a pressure sensing body configured to measure and indicate an air pressure, the pressure sensing body having;
 a cylindrical shape with a central internal hollowed section; 
 an inner cylinder having a first plunger, the inner cylinder configured to surround a portion of the hollowed section, the inner cylinder including a port to permit fluid communication between the hollowed section and a portion of the inner cylinder; and 
 an outer cylinder having a second plunger, the outer cylinder radially coupled to an outer portion of the inner cylinder, the outer cylinder in fluid communication with the inner cylinder; 
 
 a fluid located between the first plunger and the second plunger, the fluid passing between both the inner cylinder and the outer cylinder as pressure changes within the hollowed section; and 
 a valve core coupled to the pressure sensing body and covering the internal hollowed section, the valve core configured to regulate pressure inside the internal hollowed section uniformly through the inner and outer cylinders; 
 wherein the pressure sensing body is coupled over and around the tire valve stem, the valve core compressing the stem cap to an open position when the pressure sensing body is seated on the tire valve stem. 
 
     
     
       11. The assembly of  claim 10 , wherein the valve core includes a stem tip configured to regulate airflow through the valve body and through the tire valve stem. 
     
     
       12. The assembly of  claim 10 , further comprising:
 a viewing pane in communication with an outer wall of the outer cylinder, the viewing pane is at least partially transparent so as to permit observation of the pressure level in the internal hollowed section. 
 
     
     
       13. The assembly of  claim 12 , wherein the viewing pane is configured to provide markings to indicate the air pressure within the internal hollowed section. 
     
     
       14. The assembly of  claim 10 , wherein the volume of the inner cylinder is different from the volume of the outer cylinder. 
     
     
       15. The assembly of  claim 10 , further comprising:
 a spring within the outer cylinder to press against the second plunger, the spring and the air pressure in the hollowed section act upon the first and second plunger. 
 
     
     
       16. The assembly of  claim 15 , wherein pressure changes in the hollowed section cause the first plunger and the second plunger to translate within the respective cylinder. 
     
     
       17. The assembly of  claim 15 , wherein at least one of the fluid and the second plunger store light energy.